Why Does PHP\'s DOMDocument Have Trouble Handling UTF-8 Characters?

PHP DOMDocument Struggles with UTF-8 Encoding (☆)

Encountering difficulties with PHP's DOMDocument handling UTF-8 characters? Your webserver, files, and settings may be configured for UTF-8, but the DOMDocument remains problematic. We'll explore the issue and provide solutions to ensure proper UTF-8 interpretation.

The Root of the Issue:

DOMDocument::loadHTML() expects an HTML string, typically encoded in ISO-8859-1 according to HTML specifications. However, UTF-8-encoded strings, such as yours, are incompatible with this expectation.

Solution 1: Convert to HTML Entities

To resolve this incompatibility, convert all characters exceeding Unicode value 127 (h7F) to HTML entities. The mb_convert_encoding function with the HTML-ENTITIES target encoding can accomplish this task:

<code class="php">$us_ascii = mb_convert_encoding($utf_8, 'HTML-ENTITIES', 'UTF-8');</code>

Solution 2: Add an HTML Meta Tag

Alternatively, you can hint the encoding by adding a tag specifying the charset:

<code class="php">$dom = new DomDocument();
$dom->loadHTML('<meta http-equiv="content-type" content="text/html; charset=utf-8">'.$html);</code>

This tag is automatically placed in the section, following HTML 2.0 specifications.

Ensure Accurate Encoding

Lastly, verify that your input string is genuinely encoded in UTF-8. Mixed encodings can be present in some inputs, complicating the conversion process. Employ regular expressions to perform targeted string replacements as necessary.

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